package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

import static org.springframework.beans.BeanUtils.copyProperties;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // DO 后期需要进行md5加密，然后再进行比对
        //先讲前端的密码进行md5加密，再和数据库中的密码进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());

        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 保存员工信息
     *
     * @param employeeDTO 员工数据传输对象，包含要保存的员工信息
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        // 创建一个新的员工对象
        Employee employee = new Employee();
        // 将员工DTO中的属性复制到员工对象中
        copyProperties(employeeDTO, employee);
        // 设置员工的初始密码为MD5加密后的默认密码
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        // 设置员工状态为启用
        employee.setStatus(StatusConstant.ENABLE);
        // 将员工对象插入到数据库中
        employeeMapper.insert(employee);
    }

    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        List<Employee> rows = employeeMapper.list(employeePageQueryDTO);
        Page<Employee> p = (Page<Employee>) rows;
        return new PageResult(p.getTotal(), p.getResult());
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        Employee employee = new Employee();
        employee.setId(id);
        employee.setStatus(status);
        employeeMapper.update(employee);


    }

    @Override
    public Employee getById(Long id) {
        return employeeMapper.getById(id);
    }

    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        copyProperties(employeeDTO, employee);
        employeeMapper.update(employee);
    }

    @Override
    public void updatePassword(PasswordEditDTO passwordEditDTO) {
        Long empId = BaseContext.getCurrentId();
        Employee employee = employeeMapper.getById(empId);
        String password = employee.getPassword();
        String oldPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getOldPassword().getBytes());
        String newPassword = DigestUtils.md5DigestAsHex(passwordEditDTO.getNewPassword().getBytes());

        if (!password.equals(oldPassword)) {
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }
        if (newPassword.equals(oldPassword)) {
            throw new PasswordEditFailedException(MessageConstant.PASSWORD_MATCHES_OLD);
        }

        employee.setPassword(newPassword);
        employeeMapper.update(employee);
    }

}
